At 12:07 PM 8/24/01 -0500, you wrote:

On (a bit of) reflection, you may be better off using a cheap bipolar
op-amp (eg. 1/2 LM358) as an amplifier with a smaller resistor than your 2M.
Cost of those is very low.

   +5
Eg. |
  |/
  |\ E
    |            | \
    x------------|+  \
    |            |     -------x-------------> 0-3.5V
  [200K]      x--|-  /        |
    |         |  | /        [Rf 150K]
   0V         |               |
            [180K]            |
              |               |
              x---------------x
              |
             Rg 20K
              |
             0V

Best regards,
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